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Fails Emission Test
- Ensure air intake system is not restricted.
- Ensure engine is at normal operating temperature.
- Ensure fuel system pressure is correct.
- Ensure base timing is correct.
- Check for correct PCV valve operation.
- Check crankcase for gasoline contamination.
- Test ISC actuator.
- Test EGR system for correct operation.
- Test purge control valve operation.
- Ensure throttle position sensor has correct adjustment and resistance value.
- Test operation of coolant temperature sensor.
- Ensure exhaust system is not restricted.